70S2HA (EI142)
Springs of clock mechanisms, large springs for important purposes.
Classification
| Country |
Section |
Category |
| CIS, Russia, Ukraine |
Structural steel |
Spring-spring structural steel |
Chemical composition
| Standard |
Fe, % |
Si, % |
Mn, % |
Cr, % |
Cu, % |
Ni, % |
P, % |
C, % |
S, % |
|---|
| GOST 14959-79 |
96.05–97.35 |
1.4–1.7 |
0.4–0.6 |
0.2–0.4 |
< 0.2 |
< 0.25 |
< 0.025 |
0.65–0.75 |
< 0.025 |
Information on suppliers
Mechanical properties at 20 °C
| Rolling |
Standard |
Size, mm |
Tension |
Classifiers |
$$\sigma _{U}$$, $$MPa$$ |
d5, % |
Treatment |
|---|
| The tape is annealed. |
GOST 2283-79 |
0.1–4 |
|
annealing |
880 |
8 |
|
| The tape is hardcore. |
GOST 2283-79 |
0.1–4 |
|
cold-work |
780–1180 |
|
|
Technological Properties
| Weldability |
Flake Susceptibility |
Propensity to temper brittleness |
|---|
| Not applicable for welded structures |
not sensitive |
not inclined |
Analogues
Standards
Description of chemical elements
| Element |
Units of measurement |
Description |
| Fe |
% |
Iron |
| Si |
% |
Silicon |
| Mn |
% |
Manganese |
| Cr |
% |
Chrome |
| Cu |
% |
Copper |
| Ni |
% |
Nickel |
| P |
% |
Phosphorus |
| C |
% |
Carbon |
| S |
% |
Sulfur |
Description of mechanical properties
| Parameter |
Units of measurement |
Description |
| d5 |
% |
Elongation at break |
| $$\sigma _{U}$$ |
$$MPa$$ |
Ultimate tensile strength |
Designation of types of weldability
| Parameter |
Units of measurement |
Description |
| no limits |
|
Welding is performed without heating and without subsequent heat treatment |
| Boundedly welded |
|
Welding is possible with heating up to 100–120 °C and subsequent heat treatment |
| Difficult to weld |
|
For obtaining quality welded joints, additional operations are required: heating up to 200–300 °C for welding, heat treatment after welding — annealing |
| Not applicable for welded structures |
|
|